Sound-box.



W. E. PARKER.

SOUND BOX.

APPLICATION FILED SEPT.

Patentgd Mar. 30, 1915 I 5 mm wto'z 'r FFIOE.

WILLIAM E. PARKER, F- BRIDGEPORT, CONNECTICUT, ASSIGNOIt T0 AMERICANGRAPHOPHONECOMPANY, OF BRIDGEPORT, CONNECTICUT, A CORPORATION OF -WESTVIRGINIA.

Toall whom it may concern:

Be it known that I, TVILLIAM E. PARKER, a citizen of the United States,and a resident of Bridgeport, Connecticut, have invented a new anduseful Improvement in Sound- Boxes, which invention is fully setforthin' the following specification. v

This invention relates to sound-boxes for talkingmachines, and consistsof novel means for fulcruming the stylus-bar upon the sound-box.

The invention comprisesa novel arrange ment of cone-bearings, novelmeans of'applying adjustable and yielding pressure to hold the-partstogether, and various features of construction and arrangement that arehereinafter pointed out and claimed] This invention will be bestunderstood by reference to the annexed drawings'that illustrate apreferred embodiment thereof. In

these draWings,--Figure 1 is 'a sectional view taken transverselythrough a soundbox employing the present invention; Fig. 2

isa face view of the same; and Fig. 3 is a rear View of a detail.

. Thesound-box comprises the-usual shallow cup 1, having the tube 2 atits rear, preferably provided with a bayonet-joint groove for detachableconnection with the tone-arm.

" and 4 are theiusual rubber gaskets, one a one each side of the (mica)diaphragm 5;

' and 6 is the shieldheld in place by the split spring-ring 7, engagedunder the overhanging lip of the cup 1. At the center of the diaphragmis securedthe stylus-bar 8, shown.

as having the arched portion 9 and extend ing in aradial direction toits fulcrum on a projection from the sound-box. This sty1usbar carriesthe usual barrel 10 with thumbscrew or the like 11, for securing thereproducing needle 12 all as set forth in the Macdonald Patent 0.1,01ei,240, of January 9, 1912. From either side of the stylus-barv extend the wings 13-13, parallel to the abutment of the sound-box$ Fromthe adjacent face of said abutment rise the two conepointed bearin slocated at 14- -14, at right angles to the line of the Stylusbar; theinner face of thewings 13--13 are provided Specification of LettersPatent.

SOUND-BOX.

v with cone-seats that receive these points; 15

and'ts tension forces the cone-seats of wing 13 against the points withyielding'pressure,"

which may be regulated at will by turning the screw either inward oroutward.

"It will be' seen that I have provided a novel manner of mounting thestylus-bar upon the sound-box byfyielding tension that the .axis is in asingle straight li e at right angles to the line of the stylus haPatented Mar. 30, 1915.

Application filed September 25, 1912.- a Serial No.722,257.

preferablytthe center'of the diaphragm, the" twocone-bearings, and thetip of thereproducing needle, will all lie in substantially. the sameplane.

Having thus, claim: a I

In a sound-box, the combination of a dia-: phragm-receiving casinghaving-an off-set with a hole therethrougli, a diaphragm described my,invention,

emounted in said casing, a stylus-bar lying radially of said diaphragmand extending above said hole, two wings parallel to said diaphragm, andextending from said bar in opposite directions, a fulcrum-bearingbetween each wing and the adjacent portion of said off-set, a headedscrew passin through the hole aforesaid and ad ustably engaging saidbar, and 'a centrallysapertured freely i 8 5 bow-spring surrounding saidscrew and "pressing against the under side of the head thereof andhaving its two ends respectively exerting pressure against the offsetopposite the two spaced fulcrum-bearings aforesaid.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

. WILLIAM E. PARKER. Witnesses M. E. LYLE,- v. GEORGE H. SYMONS,

